Tumkosit M, Martin CG, Bayram E, Morgan TM, Lane KS, Rerkpattanapipat P, Hamilton CA, Link KM, Hundley WG. Left ventricular spherical remodeling and apical myocardial relaxation: cardiovascular MR imaging measurement of myocardial segments. Radiology. 2007 Aug; 244(2):411-8.